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Effective math tool

Anonymous A

Hello! I am looking for an effective math tool to improve my math. I am already using the free math tool from Cheng's website (the free one) and the one on preplounge. I heard about Fastmath Ace the case and the Cheng one you have to pay for. Any suggestions, reccomandations?

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Vlad replied on 09/12/2018
McKinsey / Accenture / Got all BIG3 offers / More than 300 real MBB cases / Harvard Business School

Hi,

Any of these tools are good: Preplounge Mental Math, V. Cheng, Mimir Math.

It's more about the skills. I recommend to concentrate on the following:

1) Learn how to multiply double digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo).

2) Learn how to work with zeros. You've mentioned - always use 10^power instead of zeros

Example:

300x9000 = 3*10ˆ2 x 9*10ˆ3=3x9*10ˆ(2+3)=27*10ˆ5

Handwritten it looks not that complicated. If you get used to writing all the numbers that way, you will never loose zeros and all multiplications/divisions will be replaced with + or -.

3) Learn the division table up to 1/11 (i.e. 5/6 = 83.3%). It will help you calculate any percentage problems

Good luck!

Egor
Expert
replied on 09/12/2018
McKinsey/Private equity/Harvard University/Warwick Business School/>150 real cases

Hi A,

The best one I used for my preparation and the one I suggest for my students is Mental Math.
It has 3 advantages

  1. You choose level of difficulty
  2. You practice the weakest part of your math (e.g. multiplication)
  3. You may read useful tips, while practicing

Furthermore, it teaches you problem-solving: multiplication problems are shown to be solvable by breaking problems down into medium and easy level problems.

The link is below:
https://itunes.apple.com/us/app/mental-math-cards-challenge/id500595081?mt=8

All the best,

Egor